### Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C

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1. Scope

1.1 This practice specifies the procedures for calculating the viscosity index of petroleum products, such as lubricating oils, and related materials from their kinematic viscosities at 40 and 100°C.

1.1.1 Procedure A -For petroleum products of viscosity index up to and including 100.

1.1.2 Procedure B -For petroleum products of which the viscosity index is 100 or greater.

1.2 Table 1 given in this practice applies to petroleum products with kinematic viscosities between 2 and 70 mm /s (cSt) at 100°C. Equations are provided for calculating viscosity index for petroleum products having kinematic viscosities above 70 mm /s (cSt) at 100°C.

1.3 The kinematic viscosity values are determined with reference to a value of 1.0038 mm /s (cSt) at 20.00°C for distilled water. The determination of the kinematic viscosity of a petroleum product shall be carried out in accordance with Test Methods D445, IP 71, ISO 3104, or ISO 2909.

1.4 The values stated in SI units are to be regarded as the standard.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D341 Practice for Viscosity-Temperature Charts for Liquid Petroleum Products

D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

D1695 Terminology of Cellulose and Cellulose Derivatives

D7042 Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)

E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

ISO Standards

ISO 3104

ICS Code

ICS Number Code 75.080 (Petroleum products in general)

UNSPSC Code

UNSPSC Code 15101500(Petroleum and distillates)

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DOI: 10.1520/D2270-93R98

Citation Format

ASTM D2270-93(1998), Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100°C, ASTM International, West Conshohocken, PA, 1998, www.astm.org